2.4.0.822259201 - Disclosure - Segment Information Level 2 Segment Information (Policies)truefalsefalse1false falsefalseD2012Q4YTDhttp://www.sec.gov/CIK0001328581duration2012-01-01T00:00:002012-12-31T00:00:001true 1bcc_SegmentInformationAbstractbcc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Segment Information [Abstract]2false 2us-gaap_SegmentReportingPolicyPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;text-indent:48px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The segments' profits and losses are measured on operating profits before interest expense and interest income. Specified expenses are allocated to the segments. For many of these allocated expenses, the related assets and liabilities remain in the Corporate and Other segment.</font></div></div>falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for segment reporting.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 false0Segment Reporting, Policy [Policy Text Block]falseSegment Information Level 2 Segment Information (Policies)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.bc.com/role/SegmentInformationLevel2SegmentInformationPolicies12